CODEWITHSUNDEEP
jpainsert-updateone-to-manyhibernate-4.x
grachol
grachol

Reputation: 82

JPA 2.0 hobernate 4+ @OneToMany unidirectional set

I read a lot of topic and forum about @OneToMany but unfortunatelly any of this couldn't help.

For example we have Entities like these:

@Entity
@Table(name = "MANAGER")
public class Manager{

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "MAN_ID")
    private long id;

    @OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
    @JoinColumn(name = "MAN_ID", updatable=true)     
    private Set<Workers> workers;

    @OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
    @JoinColumn(name = "MAN_ID", updatable=true)   
    private Set<Helpers> helpers;

...
}

@Entity
@Table(name = "WORKERS")
public class Workers{

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "ID")
    private long id;

...
}

@Entity
@Table(name = "HELPERS")
public class Helpers{

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "ID")
    private long id;

...
}

And now im trying to save first time Manager object (with not empty both sets)

Session session = getSession();
Transaction tx = session.beginTransaction();
session.save(holder);
tx.commit();

In return i see how hibernate tries to do inserts, but there is not update for workers and helpers. When im getting Manager back from DB, both lists are empty (null). What am i missing here?

Upvotes: 0

Views: 436

Answers (1)

grachol
grachol

Reputation: 82

It looks like i was missing nullable 

@JoinColumn(name = "MAN_ID", nullable = false)

Upvotes: 2

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